im terrible at parkour plz help me im like this...

Check out basic running tutorials on youtube. I think Con Con on youtube has a good in-depth tutorial. Running should really be your main goal until you can do it without too much effort. Even I can't run yet, I never spent more than 2 hours trying to learn.

Even with being very familiar with all the joints and what they do and how they behave, one would need several well spent hours to be able to run well.

And then it would take several days worth of practice with relatively good running skills to be able to start parkouring and jumping and all that crazy shit.

But as they always say, practice makes perfect.